python-pyyaml: enable native build

Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-python/recipes-devtools/python/python-pyyaml_3.10.bb

@@ -20,3 +20,5 @@ do_configure_prepend() {
     # upstream setup.py overcomplicated, use ours
     install -m 0644 ${WORKDIR}/setup.py ${S}
 }
+
+BBCLASSEXTEND = "native"